Yes the very best are indeed hard cast with gas checks, but that is only 1/2 the answer.
Bullet shape (design) is very important. I am one of the former CEOs of Cast Performance Bullet Company and in my days as the head ballistician and later the CEO of that company I tested many hundreds of thousands of rounds with various bullets, ranging from our own cast bullet to every competitors bullet we could get (all of them I believe) from jackets hollow points, Jacketed soft points, swaged, various shapes and designs of cast, and also bonded and partitioned jacketed.
So to answer your question I must ask a question:
Do you load your own ammo?
If you do, getting some LBT style 180-187 grain Wide Flat-Nose Gas Checked bullets (or a mold to make them and die to install the gas checks) and loading them on a good charge of WW 296 or H110 is the best you can get.
If you don’t load your own, you can buy Buffalo Bore Brand and get the same kind of load commercially. VERY pricy, but they truly are excellent. https://www.buffalobore.com/index.php?l=product_list&c=162. They need to be zeroed however because the bullet weight and pressure curve of the rounds make the gun shoot to a different point of impact than it would with standard ammo.
Lacking either of those 2 options I can also say in the area of the jacketed rounds available, those loaded with the Hornady XTP bullets do very well also. Not as good, but still very good none the less.
The XTP hollow Points are designed to expand well and any expansion makes a larger wound then the same bullet would make with no expansion, but understand nothing you can do with a set amount of energy can increase it’s power (Mass X Velocity is the measure of energy) So if you have five 180 grain bullets going (for example) 1300 FPS, every one has the same amount of energy. But HOW that energy is transferred is something different bullets do in vastly different ways.
For large animals where the fur and/or hair is thick, often wet or dirty, and the muscles are large and powerful, and bones strong and thick, a rapid expansion is often a recipe to disaster. A lot of energy is put on target and the damage is great, but not deep enough to make a clean kill, and a wounded bear is the stuff of legend. Wounded bears are VERY dangerous not just to the shooter but to every one and every thing that bear comes into contact with later. If you shoot you MUST kill because if you don’t you make the problem a lot worse. The XTP Hornady bullets do an excellent job of giving a good diameter wound and still able to get clear through the animal. Many (if not most) H.P bullets will not. However a friend of mine just 2 weeks ago killed a cow elk with one of the 158 grain Hornady Hollow Point rounds fried from a rifle, and the bullet went clear through and exited the elk length wise. Distance of the shot was 168 yards.
In my tests on game and also in the lab the XTP was always a bit behind our LBT cast Gas-Checked bullets in overall performance, but not very much behind to be 100% honest. And that ammo is easy to get.
A hard cast Keith SWC is good, but the very best is the LBT style Wide Flat Nose. But they are not as easy to get in many places. Those that buy a mold and cast their own bullets and also load their own ammo have many options easily available to them that the shooter who only buys what he or she can find doesn’t have. Yes you can buy the same kind of ammo, but it’s not inexpensive.
A lot to read and consider here, but I hope I was helpful to you.